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(3/10)*x+1/5 = 4/5 // - 4/5
(3/10)*x+1/5-(4/5) = 0
(3/10)*x+1/5-4/5 = 0
3/10*x-3/5 = 0 // + 3/5
3/10*x = 3/5 // : 3/10
x = 3/5/3/10
x = 2
x = 2
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